Balanced pair cable has higher attenuation at higher frequencies, hence the longer the wire between DSLAM and subscriber, the slower the maximum possible data rate. The following is a rough guide to the relation between wire distance and maximum data rate. Local conditions may vary, especially beyond 2 km, often necessitating a closer DSLAM to bring acceptable speeds:
Speed Mbit/s | Distance (km) |
25 | 0.30 |
24 | 0.6 |
23 | 0.9 |
22 | 1.2 |
21 | 1.5 |
19 | 1.8 |
16 | 2.1 |
1.5 | 4.5 |
0.8 | 5.2 |